Judging by what you narrated, if at all there is a true reason why the account was blocked, it can't be for the data error but for the big withdrawal filed. It is not the first time some casinos have used deceit like this to steal customers' winning and will frustrate them from fulfilling the criteria they claim to be the issues, that's if they even answer them again.
About the data error, it shouldn't even be as difficult as this between a casino and the customer, errors are bound to happen, so even if the person made a mistake, it is the right of the casino to call his attention to it and the two parties should work together to resolve it, and not in a manner of cruelty like blocking the account, for what? However, my position on this is only possible in a sane environment and I am a witness to it. I made a mistake with my name spelling with one of my traditional brokers many years back, and when I sent my documents for KYC verification, they detected the mistake by themselves and did not tell me anything when they internally changed it all themselves. I only noticed late, that's how it should be. Even if they can't change it for you, they may call your attention to it, not blocking the account, that's harsh.
agreed, it would be good to resolve it by agreement between both parties, because in my opinion, by not paying other people's winnings that have been obtained, perhaps it could also reduce the reputation of their own casino with the person who has received the winnings but was not paid, he posted the casino because not paying them and giving negative comments, of course it will affect their casino's reputation to a small extent. By resolving the problems that occur that must be done, especially with the staff who work at the casino, I think they work to resolve the problems that occur with their customers.
I have experienced where I entered an account number that was mine, but when I withdrew the winnings the number was changed. I don't understand what happened but I registered at a casino which had almost the same name and I registered with a different account number, also when I made a deposit with the account number I had it was successful but when I withdrew the winnings my account number changed, I don't know maybe they are mutually exclusive. It's related between one casino and another or whatever but I don't mind it because it's just a small win too. So what I did was just change casinos and didn't bother.